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PLC uses microelectronic technology to complete various control functions. Under the action of on-site input signals, according to the pre-input program, it controls the on-site actuators and operates according to certain rules. Next, let's take a look at the main functions of PLC.
Here is the content list:
Sequential logic control
Sport control
Timing control
Count control
Step control
Data processing
Analog, digital and digital, analog conversion
Communication and Networking
Sequential logic control is the most basic and widest application field of Integrated solutions for automation and operation, which is used to replace the relay control system to realize logic control and sequence control. It can be used for single-machine control or multi-machine control and can be used for automatic production line control. According to the operation buttons, limit switches, and other command signals given on-site, PLC controls the mechanical moving parts to perform corresponding operations.
In the machining industry, PLC is integrated with computer numerical control (CNC) to complete the motion control of machine tools. Many PLC manufacturers have provided single-axis or multi-axis position control templates for dragging stepper motors or servo motors. In most cases, the programmable logic controller sends data describing the target position to the template, and the template moves one or several axes to the target position. As each axis moves, the position control template maintains proper speed and acceleration, ensuring smooth motion. It has been used to control centerless grinding, stamping, segment blanking of complex parts, hobbing, and grinding applications.
PLC provides users with a certain number of timers, and set timer instructions, such as OMRON's CPM1A, each timer can achieve timing control of 0.1~999.9s or 0.01~99.9s, S7-200 series of SIEMENS company can Provide timers with time base units of 0.1s/0`01s and 0.00s to realize timing from 0.001s to 3276.7s. The extension of the timing time can be carried out in a certain way. High timing precision, convenient and flexible timing setting. PLC also provides high-precision clock pulses for accurate real-time control.
The counters provided by PLC for users are divided into ordinary counters, reversible counters (increase and decrease counters), high-speed counters, etc., which are used to complete counting control commands for different purposes. When the counter value is equal to the counter set value, or within a certain value range, a control command is issued. The counting value of the counter can be read out during operation, and can also be modified during operation.
PLC provides users with a certain number of shift registers, and the step control function can be easily completed with the shift registers. After one process is completed, the next process is automatically carried out. After one working cycle ends, it automatically enters the next working cycle. Some Wide Range of Quality Products at Great Prices also have special step control instructions, making step control more convenient.
Most PLCs have different levels of data processing functions, such as F2 series, C series, S7 series PLC, etc., and can complete data operations such as; addition, subtraction, multiplication, division, square root, etc., logic operations such as; word And, word or, word XOR, negation, etc., shifting, data comparison, and conversion of transmitted values.
In process control or closed-loop control systems, there are continuously changing physical quantities such as temperature, pressure, flow, velocity displacement, current, and voltage. In the past, PLC was used for logic control, and the control of these physical quantities mainly relied on instrument control or distributed system DCS. Both large and medium-sized PLCs have physical processing functions, and many small High performers also have physical quantity processing functions, which are very convenient for programming and use.
Most of the PLCs have communication capabilities, which can realize communication between PLCs and computers, and between PLCs and PLCs. Through these communication technologies, it is easier for Industrial Automation Products to form a factory automation (FA) system. It can also be connected to external devices such as printers and monitors to record and monitor relevant data. According to the user's usage and characteristics, PLC can be divided into two completely different markets: the project market and the OEM market. In the project market, PLC is mainly used in metallurgy, automobile, municipal, electric power, and other industries. In the OEM market, PLC is mainly used in traditional industries such as textile machinery, packaging, and machine tools.
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